connect to mysql with php

[Pat kilgore]

I have YDL 5.0 installed on an iBook installed as a server with apache, php, 
and mysql selected as installed services.
MySQL is running and from command line I have created database, table and 
data.
Problem is connecting to mysql with php.
The line
$con = mysql_connect("localhost","root");
in php page breaks the script and nothing after this line will execute.
php functions run ok.

Pat

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